DNS poisoning in Computer Networks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is DNS poisoning?

DNS poisoning is a cyber attack where false information is inserted into a DNS server's cache. This causes users to be redirected to fake websites instead of the real ones they want to visit.

beginner

How does DNS poisoning affect internet users?

It can trick users into visiting fake websites that look real. These fake sites can steal personal information like passwords or install harmful software.

beginner

What is a DNS cache?

A DNS cache is a temporary storage on a computer or server that saves recent website address lookups to speed up future visits.

intermediate

Name one common method to prevent DNS poisoning.

Using DNS Security Extensions (DNSSEC) helps verify that DNS responses are authentic and have not been tampered with.

intermediate

Why is DNS poisoning dangerous for businesses?

It can lead to loss of customer trust, theft of sensitive data, and damage to the company's reputation if customers are redirected to fraudulent sites.

What does DNS stand for?

A Domain Name System

B Data Network Service

C Digital Name Server

D Domain Number Service

DNS stands for Domain Name System, which translates website names into IP addresses.

What is the main goal of DNS poisoning?

A To block access to websites

B To speed up internet browsing

C To redirect users to fake websites

D To improve website security

DNS poisoning aims to redirect users to fake websites by giving wrong address information.

Which of these helps protect against DNS poisoning?

A Disabling cookies

B Using DNSSEC

C Using a VPN

D Clearing browser history

DNSSEC adds security to DNS by verifying the authenticity of responses.

Where is DNS cache stored?

A On your computer or DNS server

B Only on the website server

C In your email inbox

D On your internet provider's billing system

DNS cache is stored on your computer or DNS servers to speed up website address lookups.

What can happen if you visit a fake website due to DNS poisoning?

A Your computer will automatically update

B You will get free software

C Your internet speed will increase

D You might lose personal information

Fake websites can steal personal information like passwords or credit card details.

Explain in your own words what DNS poisoning is and why it is a security risk.

Think about how wrong address info can trick you online.

Describe one way to protect against DNS poisoning and how it works.

Consider how websites prove they are real.